CN102300154A - Method and device for updating key in multimedia broadcast system - Google Patents

Abstract

The invention discloses a method and device for key update in a multimedia broadcasting system. The method comprises: a terminal generates a corresponding service key request message according to the identifier of a subscription package, and sends the message to NAF via a WAP gateway; NAF receives After the service key request message, encapsulate the keys of all the services in the package in a key package according to the package identifier in the message, and send the service key message carrying the key package to the terminal via the WAP gateway; the terminal Parse the received service key message, obtain and write the key. The present invention pushes a new key according to the instruction of the package, and the pressure of pushing the key only increases with the increase of the number of packages and the number of users, and has no direct relationship with the number of services, which greatly reduces the number of service key pushes and saves bandwidth resources.

Description

Method and device for renewing key in multimedia broadcasting system

technical field

The invention relates to a key update technology, in particular to a key update method and device in a multimedia broadcasting system.

Background technique

The multimedia broadcast service management system MBBMS, that is, the mobile TV system, is a mobile TV service application based on broadcast technology. MBBMS can not only make the application of broadcast-based video streaming on mobile phones as popular as TV, but also make it operable and manageable.

Key management is one of the main management functions of the MBBMS system. At present, the 3GPP method is adopted for the key update in the key management, that is, the key is pushed to each updated channel one by one. With the widespread popularization of mobile TV services, the number of channels is also increasing. Pushing keys to channels one by one will inevitably put a huge pressure on the key update process. Moreover, MBBMS itself is a three-network integration service, and the key acquisition process is already very long. If the key is pushed for each channel according to the existing method, the interaction between the systems will be quite frequent. The key is regularly updated every month. With the increase of the number of users and the number of channels, it will inevitably cause the key to be unavailable due to network channel congestion during the push process, and eventually cause the user to be unable to watch mobile TV.

The above problems are mainly caused by the mobile TV service subscription model. At present, users order services according to packages, which can include one channel or multiple channels. From the perspective of operation mode, multi-channel packages will be the mainstream now and even in the future, both domestically and internationally. According to the existing method, for a multi-channel package, the monthly key update requires multiple push processes, which causes the terminal to initiate multiple key request processes, which is a waste of resources.

Contents of the invention

The purpose of the present invention is to provide a key update method in a multimedia broadcasting system, which is used to reduce the number of key push times.

Another object of the present invention is to provide a key update device in a multimedia broadcasting system, which is used to reduce the number of key push times.

According to one aspect of the present invention, a method for updating keys in a multimedia broadcasting system is provided, comprising the following steps:

A. The terminal generates a corresponding service key request message according to the identifier of the subscription package, and sends the message to the NAF via the WAP gateway;

B. After receiving the service key request message, NAF encapsulates the keys of all the services in the package in a key package according to the package identifier in the message, and sends the service carrying the key package to the terminal via the WAP gateway key message;

C. The terminal parses the received service key message, obtains and writes the key.

According to another aspect of the present invention, a key update device in a multimedia broadcasting system is provided, including:

The receiving module is used to receive the service key request message containing the package identification sent by the terminal;

An encapsulation module, configured to encapsulate the keys of all services in the package in a key bag according to the package identifier in the service key request message;

The sending module is used to send the encapsulated key package for the terminal to update the service key.

Compared with the prior art, the beneficial effect of the present invention is that: the present invention pushes the new key according to the instruction of the package, and the pressure of pushing the key only increases with the increase of the number of packages and the number of users, and the quantity of business There is no direct relationship, which greatly reduces the number of service key pushes and saves bandwidth resources.

Description of drawings

Fig. 1 is a flow chart of a key update method in a multimedia broadcasting system provided by the present invention;

Fig. 2 is a logical structural diagram of a key updating device in a multimedia broadcasting system provided by the present invention;

Fig. 3 is a schematic diagram of the network structure of the multimedia broadcasting system provided by the present invention;

FIG. 4 is a schematic diagram of a service key update process provided by an embodiment of the present invention;

Fig. 5 is a schematic flowchart of pushing a key according to a package instruction provided by an embodiment of the present invention.

Detailed ways

The preferred embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings. It should be understood that the preferred embodiments described below are only used to illustrate and explain the present invention, and are not intended to limit the present invention.

Fig. 1 has shown key updating method flow process in the multimedia broadcasting system provided by the present invention, as shown in Fig. 1:

Step S101, the terminal generates a corresponding service key request message according to the identifier of the subscription package, and sends the message to the NAF via the WAP gateway.

NAF regularly updates the key every month, and queries the package and business related information in the database. When NAF pushes the service key, it checks the subscription status of the user package and caches the user information, and then sends the service key according to the instructions of the package The notification message Notify, the SMS gateway and the SMS center receive the Notify message and forward it, and return the response information at the same time.

The terminal can also initiate a key update, and after ordering a package, assign a package identifier to the NAF and send it to the terminal.

After receiving the Notify message, the terminal generates a corresponding service key request message according to the package identifier therein and sends the message to the NAF via the WAP gateway.

Step S102: After receiving the service key request message, the NAF encapsulates the keys of all the services in the package in a key package according to the package identifier in the message, and sends the key package carrying the key package to the terminal via the WAP gateway. Business key message.

After receiving the key request message, the NAF queries the service identifiers of all the services contained in the package according to the package identifier, and then queries the corresponding service keys according to each service identifier, and encapsulates these service keys in an encrypted key bag, and then send the service key message carrying the encapsulated key bag to the terminal via the WAP gateway.

Step S103, the terminal parses the received service key message, obtains and writes the key.

Fig. 2 has shown the logic structure of key updating device in the multimedia broadcasting system provided by the present invention, as shown in Fig. 2, this device comprises:

The receiving module is configured to receive the service key request message containing the package identification sent by the terminal.

An encapsulation module, configured to encapsulate the keys of all services in the package into a key package according to the package identifier in the service key request message.

The sending module is used to send the encapsulated key package for the terminal to update the service key.

Fig. 3 shows the schematic diagram of the networking structure of the multimedia broadcasting system provided by the present invention. As shown in Fig. 3, the system includes a service processing module NAF, a short message gateway, a short message center, a WAP gateway and a terminal, wherein the NAF includes a receiving module and an encapsulation module and sending module.

Figure 4 shows a schematic diagram of the service key update process provided by the embodiment of the present invention, as shown in Figure 4:

Step 1. NAF updates the service key at a specified time every month, and sends a service key update notification message Notify at the specified time.

Step 2: NAF checks the subscription relationship of the user, and caches the package information ordered by the user.

In step 3, the NAF sends a service key notification message to the SMS gateway. NAF will encapsulate the service key notification message according to the key indicated by the package.

Step 4, the SMS gateway returns a response message to the NAF.

Step 5: The SMS gateway forwards the service key notification message to the SMS center.

In step 6, the SMS center returns a response message to the SMS gateway.

In step 7, the SMS center sends a service key notification message to the terminal.

Step 8: After receiving the service key notification message, the terminal sends a service key request message to the access WAP gateway according to the package identifier in the message.

In step 9, the WAP gateway forwards the service key request message to the NAF.

Step 10: According to the package ID carried in the request, NAF queries the service IDs of all services under the package, and then encapsulates the service keys corresponding to these service IDs in a key package.

In step 11, the NAF sends the service key message packet to the WAP gateway where the user accesses.

Step 12, the WAP gateway sends the service key message packet to the terminal. After receiving the service key message packet, the terminal analyzes it and writes the service key into the card.

Figure 5 shows a schematic flow chart of pushing a key according to the package indication provided by the embodiment of the present invention, as shown in Figure 5:

Step S501, NAF regularly updates the service key every month, and NAF stores the service key identifier and its corresponding service key, package identifier, and all services contained in each package, the service identifier and its corresponding services in the database;

Step S502, NAF pushes the service key every month, at this time, NAF checks the subscription status of the user package, and caches the user subscription information;

Step S503, NAF sends a service key notification message to the terminal according to the package instruction;

Step S504, after receiving the service key notification message sent by the NAF, the terminal sends a service key request message to the NAF using the package identifier in it;

Step S505, NAF queries the service identifiers of all services included in the package according to the package identifier carried in the terminal request;

Step S506, NAF queries the service key corresponding to the service identifier, and encapsulates these service keys in a key bag;

In step S507, the NAF sends a service key message to the terminal, and the message carries the encapsulated key package.

Step S508, the terminal receives the service key message sent by the NAF, and writes the service key into the card after parsing it. The process ends.

In summary, the present invention has the following technical effects: the present invention changes the original mode of pushing keys according to channels, and instead pushes new keys according to package instructions, which solves the problem of multiple pushes during monthly updates process. The new key is pushed according to the package, and the push pressure will only increase with the increase of the number of packages and users, and has no direct relationship with the number of services. Since the number of packages is much smaller than the number of services, the present invention greatly reduces the number of service key pushes, saves bandwidth resources, reduces system pressure, and effectively improves system efficiency.

Although the present invention has been described in detail above, the present invention is not limited thereto, and various modifications can be made by those skilled in the art based on the principle of the present invention. Therefore, any modifications made according to the principles of the present invention should be understood as falling within the protection scope of the present invention.

Claims (9)

1. key updating method in the multi-media broadcasting system is characterized in that, may further comprise the steps:

A, terminal generate the corresponding service secret key request message according to the sign of ordering set meal, and send this message via WAP gateway to NAF;

After B, NAF receive the business cipher key request message, all professional keys in this set meal are encapsulated in the key packet, and send the business cipher key message of carrying this key packet to terminal via WAP gateway according to the sign of the set meal in this message; And

The business cipher key message that C, terminal parses are received obtains and writes described key.

2. key updating method in a kind of multi-media broadcasting system according to claim 1, it is characterized in that, before described steps A, also comprise: after NAF upgrades business cipher key, send the business cipher key update notification message that has the set meal sign to described terminal via Short Message Service Gateway and sms center.

3. key updating method in a kind of multi-media broadcasting system according to claim 2 is characterized in that, before the described steps A, also comprises: terminal is ordered after the set meal, and NAF distributes set meal sign for it, and sends to terminal.

4. key updating method in a kind of multi-media broadcasting system according to claim 3 is characterized in that, NAF checks and cache user set meal ordering information after upgrading business cipher key, obtains the set meal sign according to described user's set meal ordering information.

5. key updating method in a kind of multi-media broadcasting system according to claim 4, it is characterized in that, described NAF preserves all professional corresponding relations and each the professional corresponding service key that set meal identifies and this set meal comprises, NAF is encapsulated in all professional business cipher keys in the set meal in the key packet according to the business cipher key request message, wherein, described NAF inquires about all professional service identifications and each the service identification corresponding service key that comprises in the corresponding set meal according to the sign of the set meal in the business cipher key request message that receives, and all business cipher keys are encapsulated in the key packet.

6. key updating method in a kind of multi-media broadcasting system according to claim 5, it is characterized in that, described set meal sign is unique to a sign that should set meal, described service identification is unique to a sign that should be professional, described business key label is unique to a sign that should business cipher key, wherein, professional corresponding business cipher key.

7. key update device in the multi-media broadcasting system is characterized in that, comprising:

Receiver module, what be used for that receiving terminal sends comprises set meal identification service secret key request message;

Package module is used for according to the set meal sign of described business cipher key request message all professional keys in this set meal being encapsulated in the key packet; And

Sending module is used to send packaged key packet, upgrades described business cipher key for terminal.

8. key update device in a kind of multi-media broadcasting system according to claim 7, it is characterized in that, described device also comprises key updating module, is used to upgrade business cipher key, and sends the business cipher key update notification message that has the set meal sign to terminal via Short Message Service Gateway and sms center.

9. key update device in a kind of multi-media broadcasting system according to claim 7, it is characterized in that terminal basis set meal sign wherein after receiving the business cipher key update notification message that has the set meal sign generates the corresponding service secret key request message and sends this message via WAP gateway to described receiver module.

Images